Custom modpack World errors / not loading

[tomwonu21]

i create a new map and its fine for a bit after a little exploring like 2-3 chunks i find it boxed in with chunk errors after i do a restart of the server the whole map just disapears with 1-2 chunks only rendered i have checked the logs and it shows every thing is normal and tryed editing world gen configs to no success...

 

this is the sort of thing that happens: http://prntscr.com/8q3cpg

 

please could some one help me

[LexManos]

Logs, also try removing fastcraft if its in.

[tomwonu21]

FastCraft is not in the pack.

Logs:

Latest: https://drive.google.com/file/d/0B0R6Pa1zoiMheDVmbjA1b1lwajA/view?usp=sharing

FML server latest: https://drive.google.com/file/d/0B0R6Pa1zoiMhbjFlNkc2NEpkWms/view?usp=sharing

[tomwonu21]

need anything else?

i still cant figure it out

[LexManos]

Nothing stands out, except for the fact that you have a crapload of mods/worlds installed.

Your best bet is to find a way to constantly reproduce and then start nuking mods until it stops.